Proximity monitor



FIG. 1 is a front elevational view of a proximity monitor showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a side view, taken from the left side of FIG. 1;

FIG. 4 is a side view, taken from the right side of FIG. 1; and,

FIG. 5 is a top plan view thereof, the bottom plan view being a mirror image thereof. 

The ornamental design for a proximity monitor, as shown and described. 